If gasoline costs $.80/L and you drive 24000km per year, then your annual cost for gasoline will be 19200 given by the function C(x) =- where x is the number of km/L that your car can travel. X a) Find your annual gasoline costs if your c) What is the average rate of change in car gets 3 km/L the annual gasoline cost as x changes from 3 to 8? b) Find your annual gasoline costs if your d) What is the instantaneous rate of car gets 8km/L change in your annual fuel costs when x = 5? The length of a rectangle is increasing at a rate of 3 cm/s. If the area of the rectangle is not changing, at what rate is the width of the rectangle changing when the length is 10 cm and the width is 5 cm